Rolling Knee Walker instead of crutches -- works like a scooter to get around. This one has larger ATV wheels in front to make it easier to navigate over ground, grass, rougher surfaces, etc. All terrain style. Accommodates tall people 6'1"-6'10", max. weight 400 lbs. Platform height at lowest setting is 19.5", highest setting is 22.5", cushion is 2" thick. REQUEST LEFT OR RIGHT - easy to change yourself.